package demo1;

class TreeNode {
    int val = 0;
    TreeNode left = null;
    TreeNode right = null;
    public TreeNode(int val) {
      this.val = val;
    }
}

public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     *
     * @param pRoot TreeNode类 
     * @return bool布尔型
     */
    public int getHeight(TreeNode root) {
        if(root == null) return 0;
        int l = getHeight(root.left);
        int r = getHeight(root.right);
        if(l == -1 || r == -1) return -1;
        if(Math.abs(l-r) > 1) return -1;
        return Math.max(l,r) + 1;
    }
    public boolean IsBalanced_Solution (TreeNode pRoot) {
        return getHeight(pRoot)!=-1;
    }
}